Device Tree Source is not correctly specified

Technical Support
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1

Hi,

I’m trying to compile my first custom build of device tree for iMX6DL and I ran into a problem.

I’ve been using the instructions from the following pages, but now I’m stuck.

http://developer.toradex.com/device-tree-customization

http://developer.toradex.com/knowledge-base/build-u-boot-and-linux-kernel-from-source-code

I tried running the command make dtbs from /u-boot-toradex$ but I get the following error.

…

LD u-boot

DTC
arch/arm/dts/imx6ull-14x14-evk.dtb

DTC
arch/arm/dts/imx6dl-icore.dtb

DTC arch/arm/dts/imx6q-icore.dtb

Device Tree Source is not correctly
specified.

Please define
‘CONFIG_DEFAULT_DEVICE_TREE’

or build with
‘DEVICE_TREE=’ argument

make1: *** [arch/arm/dts/unset.dtb]
Error 1

Can you give me an idea of what I might be doing wrong? I have no problem using U-boot to create an SD Card and flash Linux to my module using the correct configuration.

Thanks.

Scott

2

I figured it out. For some reason I wasn’t able to run make dtbs earlier in the /linux-toradex folder. I needed to run make colibri_imx6_defconfig from the Kernel instructions under http://developer.toradex.com/knowledge-base/build-u-boot-and-linux-kernel-from-source-code#Linux_Kernel.

Odd, because I was sure I already did that.

Oh well. Now on to the next step.